Purification of the body and clothes is called taharah. To have taharah for the body, one should do either ghusl or wuḍūʾ.

Contentions

Muslims who are unable to perform the prevailing form of ablution, due to skin disease or a disability, are recommended to perform tayammum. Such an alternative form of ritual purity also be accepted in cases where one fears the acquisition of hypothermia in cold weather.

Basis in Quran and hadith

The Qur'an says "For Allah loves those who turn to Him constantly and He loves those who keep themselves pure and clean."
In regard to Muslims being required to be clean when handling and reading the Qur'an, the Qur'an says "Which none shall touch but those who are clean."
The Islamic prophetMuhammad said that "Cleanliness is half of faith".

Plot

There is something horribly wrong with the bodies found in the dark city streets. Some are mutilated while others have the Price equation (wΔz = Cov (w,z) = βwzVz) carved into their flesh. Detective Eddie Argo and his new partner Helen Westcott unearth the meaning of the odd equation and realise each victim is being offered a gruesome choice: kill your loved ones, or be killed. Before long it becomes clear that the perpetrator has suffered a similar fate and is now coping by seeking a way to solve this philosophical dilemma.